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pH campuran 20 mL  0,1 M dengan 20 mL  0,2 M adala...

pH campuran 20 mL begin mathsize 14px style H Cl end style 0,1 M dengan 20 mL begin mathsize 14px style K O H end style 0,2 M adalah...

  1. begin mathsize 14px style 13 minus sign log space 5 end style

  2. begin mathsize 14px style 12 plus log space 5 end style

  3. begin mathsize 14px style 12 minus sign log space 5 end style

  4. begin mathsize 14px style 2 end style

  5. begin mathsize 14px style 2 minus sign log space 5 end style

Jawaban:

Menghitung mmol undefined dan begin mathsize 14px style K O H end style


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mmol space H Cl end cell equals cell M cross times V end cell row blank equals cell 0 comma 1 cross times 20 end cell row blank equals cell 2 space mmol end cell end table end style


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mmol space K O H end cell equals cell M cross times V end cell row blank equals cell 0 comma 2 cross times 20 end cell row blank equals cell 4 space mmol end cell end table end style

 

Persamaan reaksi yang terjadi adalah:


Karena reaksi terjadi antara asam kuat dan basa kuat, maka perhitungan dilakukan dengan menggunakan mol yang tersisa.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets K O H close square brackets end cell equals cell begin inline style fraction numerator mmol space sisa over denominator V open parentheses mL close parentheses end fraction end style end cell row blank equals cell begin inline style fraction numerator 2 space mmol over denominator 40 space mL end fraction end style end cell row blank equals cell 0 comma 05 space M end cell end table end style
 

undefined


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space 5 cross times 10 to the power of negative sign 2 end exponent end cell row blank equals cell 2 minus sign log space 5 end cell end table end style


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign left parenthesis 2 minus sign log space 5 right parenthesis end cell row blank equals cell 12 plus log space 5 end cell end table end style

Jadi, jawaban yang benar adalah B.

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